For cucumber sauce, in a small bowl, combine the first eight ingredients. Cover and refrigerate until serving.,In a large bowl, combine the onion, green pepper, cumin, salt, pepper and cayenne. Crumble turkey over mixture and mix well. Shape into six patties.,Using long-handled tongs, moisten a paper towel with cooking oil and lightly coat the grill rack. Grill, covered, over medium heat or broil 4 in. from the heat for 5-7 minutes on each side or until a thermometer reads 165° and juices run clear.,______